LOCATION ABIN OREstablished Series
TAXONOMIC CLASS: Fine, mixed, superactive, mesic Cumulic Haploxerolls
TYPICAL PEDON: Abin silty clay loam, in a cultivated area. (Colors are for moist soil unless otherwise noted.)
Ap--0 to 10 inches; very dark grayish brown (10YR 3/2) silty clay loam, dark grayish brown (10YR 4/2) dry; weak very fine subangular blocky structure; hard, friable, sticky and plastic; common very fine and fine roots; many very fine irregular pores; neutral (pH 6.6); abrupt smooth boundary. (8 to 12 inches thick)
A1--10 to 18 inches; very dark grayish brown (10YR 3/2) silty clay loam, dark grayish brown (10YR 4/2) dry; moderate fine granular structure; hard, friable, sticky and plastic; common very fine and fine roots; many irregular pores; neutral (pH 6.8); lear smooth boundary. (6 to 10 inches thick)
A2--18 to 34 inches; very dark brown (10YR 2/2) silty clay loam, very dark grayish brown (10YR 3/2) dry; weak medium subangular blocky structure parting to moderate fine granular; hard, friable, sticky and plastic; common very fine and fine roots; many very fine irregular pores; neutral (pH 6.8); clear avy boundary. (14 to 18 inches thick)
AC--34 to 44 inches; very dark grayish brown (10YR 3/2) silty clay loam, dark grayish brown (10YR 4/2) dry; weak fine subangular blocky structure parting to moderate fine granular; hard, friable, sticky and plastic; common very fine and fine roots; many very fine irregular pores; neutral (pH 7.0); clear avy boundary. (8 to 12 inches thick)
C--44 to 65 inches; very dark grayish brown (10YR 3/2) silty clay loam, dark grayish brown (10YR 4/2) dry; common fine distinct strong brown (7.5YR 4/6) and yellowish red (5YR 4/6) mottles; weak fine subangular blocky structure; hard, friable, very sticky and plastic; few fine roots; many very fine tubular pores; neutral (pH 7.0).
TYPE LOCATION: Jackson County, Oregon; about 2 miles southwest of Eagle Point; approximately 150 feet east and 50 feet south of the northwest corner of sec. 9, T. 36 S, R. 1 W.
RANGE IN CHARACTERISTICS: The soils are usually moist but are dry between depths of 4 and 12 inches for 80 to 110 consecutive days following the summer solstice. The mean annual soil temperature is 53 to 56 degrees F. Depth to bedrock is 60 inches or more. The mollic epipedon is 20 to 40 inches thick. The soil has an irregular decrease in organic carbon to a depth of 50
inches. The particle-size control section averages 35 to 45 percent clay and from 0 to 10 percent gravel. It is moderately acid through neutral.
The upper part of the A horizon has value of 2 or 3 moist, 3 through 5 dry and chroma of 1 or 2 moist and dry.
The lower part of the A horizon and AC horizon has value of 2 or 3 moist, 3 through 5 dry and chroma of 1 through 3 moist and dry. It is a silty clay loam, clay, or silty clay.
The C horizon has value of 3 or 4 moist and 4 or 5 dry and chroma of 2 or 3 moist and dry.
COMPETING SERIES: This is the Stake series. Stake soils are well drained, mlightly or moderately alkaline throughout and have a mean annual soil temperature of 49 to 53 degrees F.
GEOGRAPHIC SETTING: Abin soils are on flood plains at elevations of 1,000 to 2,500 feet. Slopes are 0 to 3 percent. The soils formed in mixed alluvium. The climate is characterized by warm dry summers and cool moist winters. The mean July temperature is 72 degrees F; the mean January temperature is 37 degrees F; the mean annual temperature is 50 to 55 degrees F. The frost-free
period is 125 to 180 days. The mean annual precipitation is 18 to 35 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Camas, Central Point, Evans, Newberg, and Medford soils. Camas and Newberg soils have a mollic epipedon less than 20 inches thick. In addition, Camas soils are sandy-skeletal and Newberg soils are coarse-loamy. Central Point and Medford soils have a regular decrease in organic carbon content with increasing depth. Central Point and Evans soils are coarse-loamy.
DRAINAGE AND PERMEABILITY: Moderately well drained; slow runoff; moderately slow permeability. The soils are occasionally flooded from December through March and have a water table at 3 to 5 feet from December through April.
USE AND VEGETATION: Abin soils are used for cultivated crops, hay and pasture, and tree fruit. Native vegetation is black cottonwood, Oregon ash, bigleaf maple, willow, blackberry, Pacific serviceberry, and Kentucky bluegrass.
DISTRIBUTION AND EXTENT: Interior valleys of southwestern Oregon. The series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Jackson County Area, Oregon, 1988.
REMARKS: The activity class was added to the classification in January of 2003. Competing series were not checked at that time. - ET
Diagnostic horizons and features in the pedon are:
Mollic epipedon - The zone from the surface to a depth of 34
inches. (Ap, A1, and A2)